#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
int a,b,c,s,p;
printf("\n\t Nhap vao canh a:");
scanf("%d",&a);
printf("\n\t Nhap vao canh b:");
scanf("%d",&b);
printf("\n\t Nhap vao canh c:");
scanf("%d",&c);
if((a+b)<c&&(a+c)<b&&(c+b)<a)
{
p=(a+b+c)/2;
s=sqrt(p*(p-a)*(p-b)*(p-c));
printf("\n Dien tich tam giac =%d",s);
}
else
printf("\n Khong co hinh tam giac");
getch();
}